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Alex walks along a curved path and takes several turns while walking from home to school. How can you best describe his displacement?

To define displacement we need both: the distance travelled and the direction.... View Article

Use the following information to answer the next question. It will be observed that

An object floats in a liquid if its density (or average density) is less than that of the liquid.In the given situation, all the four objects... View Article

A body of weight W, experiences an upthrust R in water. What will be the apparent weight of the body and apparent density of the body when W>R?

The apparent weight will be (W - R) and the apparent density will be (p - 1) gcm-3... View Article

Identify the circuit in which the electrical components have been properly connected.

An ammeter is always connected in series and a voltmeter in parallel and current always flows from the negative terminal of the battery to the... View Article

If a train is traveling due north and its brakes are applied, it will have?

Since the brakes are applied, acceleration is in the opposite direction to motion. So, the speed decreases.... View Article

Two resistors of resistance 2R and 3R are connected in series with a battery, which has an emf of E and an internal resistance R. What is the potential difference across the resistor of resistance 2R?

Here, total resistance of the circuit = 2R+3R+R = 6RTotal emf = EHence, total current in the circuit = E/6RTherefore, voltage across 2R resistor... View Article

What is the average power/cycle in a capacitor?

The average power/cycle in a capacitor is 0.... View Article

Television signals broadcast from the moon can be received on the earth while the TV broadcast from Delhi cannot be received at places about 100 km distant from Delhi. This is because

Over a long distance, earths’ surface will be curved and since TV signals travel in straight line television broad cast signals cannot be... View Article

A 2.16 g of a substance occupies 1.5 cm3. Its density to appropriate significant figure is:

There are 3 significant figures in measured mass whereas there are only 2 significant figures in measured volume. Hence density should be... View Article

The given symbol is used for representing _______ in a circuit.

When wires cross without joining, a slight jump is shown between the two wires.... View Article

STATEMENT-1: Charges experience force when they move at right angles to magnetic field. BECAUSE STATEMENT-2: A moving charge produces an electric field only.

A moving charge produces electric as well as magnetic field.... View Article

Complete the sentence, The Sun has been radiating an enormous amount of energy at the present rate for nearly——- years and will continue radiating at that rate for about ——– years more.

The Sun has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and will continue radiating at that rate... View Article

The focal length of a convex lens is

The focal length of a convex lens is always positive in accordance with the sign convention.... View Article

A ray of light incident on the optical centre of a spherical lens, after refraction passes through:

A ray of light passes through optical centre of a lens is refracted back along the same path i.e. through optical centre itself.... View Article

Speed of light in vacuum is:

Speed of light in a vacuum is 3 x 108 m/s The speed of light in a vacuum is 186, 282 miles per second. The first person to discover the speed... View Article

How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22oC is 344 m/s.

Let the distance between cliff and child be d m. Then, total distance traveled by the sound = 2d, Total time taken = 6 sThen, velocity of sound =... View Article

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